/// <summary>
/// Tries to calculate an earliest arrival route from stop1 to stop2.
/// </summary>
public override Result <Route> TryEarliestArrival(DateTime departureTime,
RouterPoint sourcePoint, Profile sourceProfile, RouterPoint targetPoint, Profile targetProfile,
EarliestArrivalSettings settings)
{
// get the get factor function.
var sourceGetFactor = _router.GetDefaultGetFactor(sourceProfile);
var targetGetFactor = _router.GetDefaultGetFactor(targetProfile);
// create the profile search.
var tripEnumerator = _db.TransitDb.GetTripsEnumerator();
var transfersDb = _db.TransitDb.GetTransfersDb(_transferProfile);
var profileSearch = new ProfileSearch(_db.TransitDb, departureTime, transfersDb, _db.TransitDb.GetIsTripPossibleFunc());
// search for sources.
var departureTimeSeconds = (uint)(departureTime - departureTime.Date).TotalSeconds;
var sourceSearch = new ClosestStopsSearch(_db, sourceProfile, sourceGetFactor, sourcePoint,
settings.MaxSecondsSource, false);
sourceSearch.StopFound = (s, t) =>
{
profileSearch.SetSourceStop(s, departureTimeSeconds + (uint)t);
return(false);
};
// search for targets.
var targetSearch = new ClosestStopsSearch(_db, targetProfile, targetGetFactor, targetPoint,
settings.MaxSecondsTarget, true);
targetSearch.StopFound = (s, t) =>
{
profileSearch.SetTargetStop(s, (uint)t);
return(false);
};
// create bidirectional helper if possible.
SearchHelper helper = null;
BidirectionalSearchHelper bidirectionalHelper = null;
if (sourceProfile.Name == targetProfile.Name)
{ // profiles are the same.
bidirectionalHelper = new BidirectionalSearchHelper(
sourceSearch.Search, targetSearch.Search);
targetSearch.WasEdgeFound = bidirectionalHelper.TargetWasFound;
}
else
{ // profiles are different but the source can still reach the destination.
helper = new SearchHelper(_router.Db, sourceSearch.Search, sourceProfile, targetPoint);
sourceSearch.WasEdgeFound = helper.SourceWasFound;
}
// run source search.
sourceSearch.Run();
if (!sourceSearch.HasRun ||
!sourceSearch.HasSucceeded)
{
return(new Result <Route>("Searching for source stops failed."));
}
// run target search.
targetSearch.Run();
if (!targetSearch.HasRun ||
!targetSearch.HasSucceeded)
{
return(new Result <Route>("Searching for target stops failed."));
}
// run actual profile search.
profileSearch.Run();
if (!profileSearch.HasRun ||
!profileSearch.HasSucceeded)
{
return(new Result <Route>("No route found."));
}
// build routes.
var profileSearchRouteBuilder = new ProfileSearchRouteBuilder(profileSearch);
profileSearchRouteBuilder.Run();
if (!profileSearchRouteBuilder.HasRun ||
!profileSearchRouteBuilder.HasSucceeded)
{
return(new Result <Route>(string.Format("Route could not be built: {0}.", profileSearchRouteBuilder.ErrorMessage)));
}
var sourceWeight = sourceSearch.GetWeight(profileSearchRouteBuilder.Stops[0]);
var targetWeight = targetSearch.GetWeight(profileSearchRouteBuilder.Stops[profileSearchRouteBuilder.Stops.Count - 1]);
var transitWeight = sourceWeight + profileSearchRouteBuilder.Duration + targetWeight;
if (bidirectionalHelper != null &&
bidirectionalHelper.HasSucceeded)
{ // there is a direct route to the target.
if (transitWeight > bidirectionalHelper.BestWeight)
{
if (!this.PreferTransit || bidirectionalHelper.BestWeight < this.PreferTransitThreshold)
{ // transit it not preferred or belof threshold.
var path = bidirectionalHelper.GetPath();
return(new Result <Route>(
CompleteRouteBuilder.Build(_router.Db, sourceProfile, sourcePoint, targetPoint, path)));
}
}
}
else if (helper != null &&
helper.HasSucceeded)
{ // there is a direct route to the target.
if (transitWeight > helper.BestWeight)
{
if (!this.PreferTransit || bidirectionalHelper.BestWeight < this.PreferTransitThreshold)
{ // transit it not preferred or belof threshold.
var path = helper.GetPath();
return(new Result <Route>(
CompleteRouteBuilder.Build(_router.Db, sourceProfile, sourcePoint, targetPoint, path)));
}
}
}
// build source/target routes.
var sourceRoute = sourceSearch.GetRoute(profileSearchRouteBuilder.Stops[0]);
var targetRoute = targetSearch.GetRoute(profileSearchRouteBuilder.Stops[profileSearchRouteBuilder.Stops.Count - 1]);
// concatenate it all.
var route = sourceRoute.Concatenate(profileSearchRouteBuilder.Route);
route = route.Concatenate(targetRoute);
return(new Result <Route>(route));
}
/// <summary>
/// Tries to calculate an earliest arrival route from stop1 to stop2.
/// </summary>
public abstract Result <Route> TryEarliestArrival(DateTime departureTime,
RouterPoint sourcePoint, Profile sourceProfile, RouterPoint targetPoint, Profile targetProfile,
EarliestArrivalSettings settings);
